Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[linux-2.6] / fs / jffs2 / summary.c
1 /*
2  * JFFS2 -- Journalling Flash File System, Version 2.
3  *
4  * Copyright (C) 2004  Ferenc Havasi <havasi@inf.u-szeged.hu>,
5  *                     Zoltan Sogor <weth@inf.u-szeged.hu>,
6  *                     Patrik Kluba <pajko@halom.u-szeged.hu>,
7  *                     University of Szeged, Hungary
8  *               2006  KaiGai Kohei <kaigai@ak.jp.nec.com>
9  *
10  * For licensing information, see the file 'LICENCE' in this directory.
11  *
12  * $Id: summary.c,v 1.4 2005/09/26 11:37:21 havasi Exp $
13  *
14  */
15
16 #include <linux/kernel.h>
17 #include <linux/sched.h>
18 #include <linux/slab.h>
19 #include <linux/mtd/mtd.h>
20 #include <linux/pagemap.h>
21 #include <linux/crc32.h>
22 #include <linux/compiler.h>
23 #include <linux/vmalloc.h>
24 #include "nodelist.h"
25 #include "debug.h"
26
27 int jffs2_sum_init(struct jffs2_sb_info *c)
28 {
29         c->summary = kmalloc(sizeof(struct jffs2_summary), GFP_KERNEL);
30
31         if (!c->summary) {
32                 JFFS2_WARNING("Can't allocate memory for summary information!\n");
33                 return -ENOMEM;
34         }
35
36         memset(c->summary, 0, sizeof(struct jffs2_summary));
37
38         c->summary->sum_buf = vmalloc(c->sector_size);
39
40         if (!c->summary->sum_buf) {
41                 JFFS2_WARNING("Can't allocate buffer for writing out summary information!\n");
42                 kfree(c->summary);
43                 return -ENOMEM;
44         }
45
46         dbg_summary("returned successfully\n");
47
48         return 0;
49 }
50
51 void jffs2_sum_exit(struct jffs2_sb_info *c)
52 {
53         dbg_summary("called\n");
54
55         jffs2_sum_disable_collecting(c->summary);
56
57         vfree(c->summary->sum_buf);
58         c->summary->sum_buf = NULL;
59
60         kfree(c->summary);
61         c->summary = NULL;
62 }
63
64 static int jffs2_sum_add_mem(struct jffs2_summary *s, union jffs2_sum_mem *item)
65 {
66         if (!s->sum_list_head)
67                 s->sum_list_head = (union jffs2_sum_mem *) item;
68         if (s->sum_list_tail)
69                 s->sum_list_tail->u.next = (union jffs2_sum_mem *) item;
70         s->sum_list_tail = (union jffs2_sum_mem *) item;
71
72         switch (je16_to_cpu(item->u.nodetype)) {
73                 case JFFS2_NODETYPE_INODE:
74                         s->sum_size += JFFS2_SUMMARY_INODE_SIZE;
75                         s->sum_num++;
76                         dbg_summary("inode (%u) added to summary\n",
77                                                 je32_to_cpu(item->i.inode));
78                         break;
79                 case JFFS2_NODETYPE_DIRENT:
80                         s->sum_size += JFFS2_SUMMARY_DIRENT_SIZE(item->d.nsize);
81                         s->sum_num++;
82                         dbg_summary("dirent (%u) added to summary\n",
83                                                 je32_to_cpu(item->d.ino));
84                         break;
85 #ifdef CONFIG_JFFS2_FS_XATTR
86                 case JFFS2_NODETYPE_XATTR:
87                         s->sum_size += JFFS2_SUMMARY_XATTR_SIZE;
88                         s->sum_num++;
89                         dbg_summary("xattr (xid=%u, version=%u) added to summary\n",
90                                     je32_to_cpu(item->x.xid), je32_to_cpu(item->x.version));
91                         break;
92                 case JFFS2_NODETYPE_XREF:
93                         s->sum_size += JFFS2_SUMMARY_XREF_SIZE;
94                         s->sum_num++;
95                         dbg_summary("xref added to summary\n");
96                         break;
97 #endif
98                 default:
99                         JFFS2_WARNING("UNKNOWN node type %u\n",
100                                             je16_to_cpu(item->u.nodetype));
101                         return 1;
102         }
103         return 0;
104 }
105
106
107 /* The following 3 functions are called from scan.c to collect summary info for not closed jeb */
108
109 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size)
110 {
111         dbg_summary("called with %u\n", size);
112         s->sum_padded += size;
113         return 0;
114 }
115
116 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri,
117                                 uint32_t ofs)
118 {
119         struct jffs2_sum_inode_mem *temp = kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
120
121         if (!temp)
122                 return -ENOMEM;
123
124         temp->nodetype = ri->nodetype;
125         temp->inode = ri->ino;
126         temp->version = ri->version;
127         temp->offset = cpu_to_je32(ofs); /* relative offset from the begining of the jeb */
128         temp->totlen = ri->totlen;
129         temp->next = NULL;
130
131         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
132 }
133
134 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd,
135                                 uint32_t ofs)
136 {
137         struct jffs2_sum_dirent_mem *temp =
138                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + rd->nsize, GFP_KERNEL);
139
140         if (!temp)
141                 return -ENOMEM;
142
143         temp->nodetype = rd->nodetype;
144         temp->totlen = rd->totlen;
145         temp->offset = cpu_to_je32(ofs);        /* relative from the begining of the jeb */
146         temp->pino = rd->pino;
147         temp->version = rd->version;
148         temp->ino = rd->ino;
149         temp->nsize = rd->nsize;
150         temp->type = rd->type;
151         temp->next = NULL;
152
153         memcpy(temp->name, rd->name, rd->nsize);
154
155         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
156 }
157
158 #ifdef CONFIG_JFFS2_FS_XATTR
159 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs)
160 {
161         struct jffs2_sum_xattr_mem *temp;
162
163         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
164         if (!temp)
165                 return -ENOMEM;
166
167         temp->nodetype = rx->nodetype;
168         temp->xid = rx->xid;
169         temp->version = rx->version;
170         temp->offset = cpu_to_je32(ofs);
171         temp->totlen = rx->totlen;
172         temp->next = NULL;
173
174         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
175 }
176
177 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs)
178 {
179         struct jffs2_sum_xref_mem *temp;
180
181         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
182         if (!temp)
183                 return -ENOMEM;
184
185         temp->nodetype = rr->nodetype;
186         temp->offset = cpu_to_je32(ofs);
187         temp->next = NULL;
188
189         return jffs2_sum_add_mem(s, (union jffs2_sum_mem *)temp);
190 }
191 #endif
192 /* Cleanup every collected summary information */
193
194 static void jffs2_sum_clean_collected(struct jffs2_summary *s)
195 {
196         union jffs2_sum_mem *temp;
197
198         if (!s->sum_list_head) {
199                 dbg_summary("already empty\n");
200         }
201         while (s->sum_list_head) {
202                 temp = s->sum_list_head;
203                 s->sum_list_head = s->sum_list_head->u.next;
204                 kfree(temp);
205         }
206         s->sum_list_tail = NULL;
207         s->sum_padded = 0;
208         s->sum_num = 0;
209 }
210
211 void jffs2_sum_reset_collected(struct jffs2_summary *s)
212 {
213         dbg_summary("called\n");
214         jffs2_sum_clean_collected(s);
215         s->sum_size = 0;
216 }
217
218 void jffs2_sum_disable_collecting(struct jffs2_summary *s)
219 {
220         dbg_summary("called\n");
221         jffs2_sum_clean_collected(s);
222         s->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
223 }
224
225 int jffs2_sum_is_disabled(struct jffs2_summary *s)
226 {
227         return (s->sum_size == JFFS2_SUMMARY_NOSUM_SIZE);
228 }
229
230 /* Move the collected summary information into sb (called from scan.c) */
231
232 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s)
233 {
234         dbg_summary("oldsize=0x%x oldnum=%u => newsize=0x%x newnum=%u\n",
235                                 c->summary->sum_size, c->summary->sum_num,
236                                 s->sum_size, s->sum_num);
237
238         c->summary->sum_size = s->sum_size;
239         c->summary->sum_num = s->sum_num;
240         c->summary->sum_padded = s->sum_padded;
241         c->summary->sum_list_head = s->sum_list_head;
242         c->summary->sum_list_tail = s->sum_list_tail;
243
244         s->sum_list_head = s->sum_list_tail = NULL;
245 }
246
247 /* Called from wbuf.c to collect writed node info */
248
249 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
250                                 unsigned long count, uint32_t ofs)
251 {
252         union jffs2_node_union *node;
253         struct jffs2_eraseblock *jeb;
254
255         node = invecs[0].iov_base;
256         jeb = &c->blocks[ofs / c->sector_size];
257         ofs -= jeb->offset;
258
259         switch (je16_to_cpu(node->u.nodetype)) {
260                 case JFFS2_NODETYPE_INODE: {
261                         struct jffs2_sum_inode_mem *temp =
262                                 kmalloc(sizeof(struct jffs2_sum_inode_mem), GFP_KERNEL);
263
264                         if (!temp)
265                                 goto no_mem;
266
267                         temp->nodetype = node->i.nodetype;
268                         temp->inode = node->i.ino;
269                         temp->version = node->i.version;
270                         temp->offset = cpu_to_je32(ofs);
271                         temp->totlen = node->i.totlen;
272                         temp->next = NULL;
273
274                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
275                 }
276
277                 case JFFS2_NODETYPE_DIRENT: {
278                         struct jffs2_sum_dirent_mem *temp =
279                                 kmalloc(sizeof(struct jffs2_sum_dirent_mem) + node->d.nsize, GFP_KERNEL);
280
281                         if (!temp)
282                                 goto no_mem;
283
284                         temp->nodetype = node->d.nodetype;
285                         temp->totlen = node->d.totlen;
286                         temp->offset = cpu_to_je32(ofs);
287                         temp->pino = node->d.pino;
288                         temp->version = node->d.version;
289                         temp->ino = node->d.ino;
290                         temp->nsize = node->d.nsize;
291                         temp->type = node->d.type;
292                         temp->next = NULL;
293
294                         switch (count) {
295                                 case 1:
296                                         memcpy(temp->name,node->d.name,node->d.nsize);
297                                         break;
298
299                                 case 2:
300                                         memcpy(temp->name,invecs[1].iov_base,node->d.nsize);
301                                         break;
302
303                                 default:
304                                         BUG();  /* impossible count value */
305                                         break;
306                         }
307
308                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
309                 }
310 #ifdef CONFIG_JFFS2_FS_XATTR
311                 case JFFS2_NODETYPE_XATTR: {
312                         struct jffs2_sum_xattr_mem *temp;
313                         temp = kmalloc(sizeof(struct jffs2_sum_xattr_mem), GFP_KERNEL);
314                         if (!temp)
315                                 goto no_mem;
316
317                         temp->nodetype = node->x.nodetype;
318                         temp->xid = node->x.xid;
319                         temp->version = node->x.version;
320                         temp->totlen = node->x.totlen;
321                         temp->offset = cpu_to_je32(ofs);
322                         temp->next = NULL;
323
324                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
325                 }
326                 case JFFS2_NODETYPE_XREF: {
327                         struct jffs2_sum_xref_mem *temp;
328                         temp = kmalloc(sizeof(struct jffs2_sum_xref_mem), GFP_KERNEL);
329                         if (!temp)
330                                 goto no_mem;
331                         temp->nodetype = node->r.nodetype;
332                         temp->offset = cpu_to_je32(ofs);
333                         temp->next = NULL;
334
335                         return jffs2_sum_add_mem(c->summary, (union jffs2_sum_mem *)temp);
336                 }
337 #endif
338                 case JFFS2_NODETYPE_PADDING:
339                         dbg_summary("node PADDING\n");
340                         c->summary->sum_padded += je32_to_cpu(node->u.totlen);
341                         break;
342
343                 case JFFS2_NODETYPE_CLEANMARKER:
344                         dbg_summary("node CLEANMARKER\n");
345                         break;
346
347                 case JFFS2_NODETYPE_SUMMARY:
348                         dbg_summary("node SUMMARY\n");
349                         break;
350
351                 default:
352                         /* If you implement a new node type you should also implement
353                            summary support for it or disable summary.
354                         */
355                         BUG();
356                         break;
357         }
358
359         return 0;
360
361 no_mem:
362         JFFS2_WARNING("MEMORY ALLOCATION ERROR!");
363         return -ENOMEM;
364 }
365
366 static struct jffs2_raw_node_ref *sum_link_node_ref(struct jffs2_sb_info *c,
367                                                     struct jffs2_eraseblock *jeb,
368                                                     uint32_t ofs, uint32_t len,
369                                                     struct jffs2_inode_cache *ic)
370 {
371         /* If there was a gap, mark it dirty */
372         if ((ofs & ~3) > c->sector_size - jeb->free_size) {
373                 /* Ew. Summary doesn't actually tell us explicitly about dirty space */
374                 jffs2_scan_dirty_space(c, jeb, (ofs & ~3) - (c->sector_size - jeb->free_size));
375         }
376
377         return jffs2_link_node_ref(c, jeb, jeb->offset + ofs, len, ic);
378 }
379
380 /* Process the stored summary information - helper function for jffs2_sum_scan_sumnode() */
381
382 static int jffs2_sum_process_sum_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
383                                 struct jffs2_raw_summary *summary, uint32_t *pseudo_random)
384 {
385         struct jffs2_inode_cache *ic;
386         struct jffs2_full_dirent *fd;
387         void *sp;
388         int i, ino;
389         int err;
390
391         sp = summary->sum;
392
393         for (i=0; i<je32_to_cpu(summary->sum_num); i++) {
394                 dbg_summary("processing summary index %d\n", i);
395
396                 /* Make sure there's a spare ref for dirty space */
397                 err = jffs2_prealloc_raw_node_refs(c, jeb, 2);
398                 if (err)
399                         return err;
400
401                 switch (je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype)) {
402                         case JFFS2_NODETYPE_INODE: {
403                                 struct jffs2_sum_inode_flash *spi;
404                                 spi = sp;
405
406                                 ino = je32_to_cpu(spi->inode);
407
408                                 dbg_summary("Inode at 0x%08x-0x%08x\n",
409                                             jeb->offset + je32_to_cpu(spi->offset),
410                                             jeb->offset + je32_to_cpu(spi->offset) + je32_to_cpu(spi->totlen));
411
412                                 ic = jffs2_scan_make_ino_cache(c, ino);
413                                 if (!ic) {
414                                         JFFS2_NOTICE("scan_make_ino_cache failed\n");
415                                         return -ENOMEM;
416                                 }
417
418                                 sum_link_node_ref(c, jeb, je32_to_cpu(spi->offset) | REF_UNCHECKED,
419                                                   PAD(je32_to_cpu(spi->totlen)), ic);
420
421                                 *pseudo_random += je32_to_cpu(spi->version);
422
423                                 sp += JFFS2_SUMMARY_INODE_SIZE;
424
425                                 break;
426                         }
427
428                         case JFFS2_NODETYPE_DIRENT: {
429                                 struct jffs2_sum_dirent_flash *spd;
430                                 spd = sp;
431
432                                 dbg_summary("Dirent at 0x%08x-0x%08x\n",
433                                             jeb->offset + je32_to_cpu(spd->offset),
434                                             jeb->offset + je32_to_cpu(spd->offset) + je32_to_cpu(spd->totlen));
435
436
437                                 fd = jffs2_alloc_full_dirent(spd->nsize+1);
438                                 if (!fd)
439                                         return -ENOMEM;
440
441                                 memcpy(&fd->name, spd->name, spd->nsize);
442                                 fd->name[spd->nsize] = 0;
443
444                                 ic = jffs2_scan_make_ino_cache(c, je32_to_cpu(spd->pino));
445                                 if (!ic) {
446                                         jffs2_free_full_dirent(fd);
447                                         return -ENOMEM;
448                                 }
449
450                                 fd->raw = sum_link_node_ref(c, jeb,  je32_to_cpu(spd->offset) | REF_UNCHECKED,
451                                                             PAD(je32_to_cpu(spd->totlen)), ic);
452
453                                 fd->next = NULL;
454                                 fd->version = je32_to_cpu(spd->version);
455                                 fd->ino = je32_to_cpu(spd->ino);
456                                 fd->nhash = full_name_hash(fd->name, spd->nsize);
457                                 fd->type = spd->type;
458
459                                 jffs2_add_fd_to_list(c, fd, &ic->scan_dents);
460
461                                 *pseudo_random += je32_to_cpu(spd->version);
462
463                                 sp += JFFS2_SUMMARY_DIRENT_SIZE(spd->nsize);
464
465                                 break;
466                         }
467 #ifdef CONFIG_JFFS2_FS_XATTR
468                         case JFFS2_NODETYPE_XATTR: {
469                                 struct jffs2_xattr_datum *xd;
470                                 struct jffs2_sum_xattr_flash *spx;
471
472                                 spx = (struct jffs2_sum_xattr_flash *)sp;
473                                 dbg_summary("xattr at %#08x-%#08x (xid=%u, version=%u)\n", 
474                                             jeb->offset + je32_to_cpu(spx->offset),
475                                             jeb->offset + je32_to_cpu(spx->offset) + je32_to_cpu(spx->totlen),
476                                             je32_to_cpu(spx->xid), je32_to_cpu(spx->version));
477
478                                 xd = jffs2_setup_xattr_datum(c, je32_to_cpu(spx->xid),
479                                                                 je32_to_cpu(spx->version));
480                                 if (IS_ERR(xd))
481                                         return PTR_ERR(xd);
482                                 if (xd->version > je32_to_cpu(spx->version)) {
483                                         /* node is not the newest one */
484                                         struct jffs2_raw_node_ref *raw
485                                                 = sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
486                                                                     PAD(je32_to_cpu(spx->totlen)), NULL);
487                                         raw->next_in_ino = xd->node->next_in_ino;
488                                         xd->node->next_in_ino = raw;
489                                 } else {
490                                         xd->version = je32_to_cpu(spx->version);
491                                         sum_link_node_ref(c, jeb, je32_to_cpu(spx->offset) | REF_UNCHECKED,
492                                                           PAD(je32_to_cpu(spx->totlen)), (void *)xd);
493                                 }
494                                 *pseudo_random += je32_to_cpu(spx->xid);
495                                 sp += JFFS2_SUMMARY_XATTR_SIZE;
496
497                                 break;
498                         }
499                         case JFFS2_NODETYPE_XREF: {
500                                 struct jffs2_xattr_ref *ref;
501                                 struct jffs2_sum_xref_flash *spr;
502
503                                 spr = (struct jffs2_sum_xref_flash *)sp;
504                                 dbg_summary("xref at %#08x-%#08x\n",
505                                             jeb->offset + je32_to_cpu(spr->offset),
506                                             jeb->offset + je32_to_cpu(spr->offset) + 
507                                             (uint32_t)PAD(sizeof(struct jffs2_raw_xref)));
508
509                                 ref = jffs2_alloc_xattr_ref();
510                                 if (!ref) {
511                                         JFFS2_NOTICE("allocation of xattr_datum failed\n");
512                                         return -ENOMEM;
513                                 }
514                                 ref->next = c->xref_temp;
515                                 c->xref_temp = ref;
516
517                                 sum_link_node_ref(c, jeb, je32_to_cpu(spr->offset) | REF_UNCHECKED,
518                                                   PAD(sizeof(struct jffs2_raw_xref)), (void *)ref);
519
520                                 *pseudo_random += ref->node->flash_offset;
521                                 sp += JFFS2_SUMMARY_XREF_SIZE;
522
523                                 break;
524                         }
525 #endif
526                         default : {
527                                 uint16_t nodetype = je16_to_cpu(((struct jffs2_sum_unknown_flash *)sp)->nodetype);
528                                 JFFS2_WARNING("Unsupported node type %x found in summary! Exiting...\n", nodetype);
529                                 if ((nodetype & JFFS2_COMPAT_MASK) == JFFS2_FEATURE_INCOMPAT)
530                                         return -EIO;
531
532                                 /* For compatible node types, just fall back to the full scan */
533                                 c->wasted_size -= jeb->wasted_size;
534                                 c->free_size += c->sector_size - jeb->free_size;
535                                 c->used_size -= jeb->used_size;
536                                 c->dirty_size -= jeb->dirty_size;
537                                 jeb->wasted_size = jeb->used_size = jeb->dirty_size = 0;
538                                 jeb->free_size = c->sector_size;
539
540                                 jffs2_free_jeb_node_refs(c, jeb);
541                                 return -ENOTRECOVERABLE;
542                         }
543                 }
544         }
545         return 0;
546 }
547
548 /* Process the summary node - called from jffs2_scan_eraseblock() */
549 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
550                            struct jffs2_raw_summary *summary, uint32_t sumsize,
551                            uint32_t *pseudo_random)
552 {
553         struct jffs2_unknown_node crcnode;
554         int ret, ofs;
555         uint32_t crc;
556
557         ofs = c->sector_size - sumsize;
558
559         dbg_summary("summary found for 0x%08x at 0x%08x (0x%x bytes)\n",
560                     jeb->offset, jeb->offset + ofs, sumsize);
561
562         /* OK, now check for node validity and CRC */
563         crcnode.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
564         crcnode.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
565         crcnode.totlen = summary->totlen;
566         crc = crc32(0, &crcnode, sizeof(crcnode)-4);
567
568         if (je32_to_cpu(summary->hdr_crc) != crc) {
569                 dbg_summary("Summary node header is corrupt (bad CRC or "
570                                 "no summary at all)\n");
571                 goto crc_err;
572         }
573
574         if (je32_to_cpu(summary->totlen) != sumsize) {
575                 dbg_summary("Summary node is corrupt (wrong erasesize?)\n");
576                 goto crc_err;
577         }
578
579         crc = crc32(0, summary, sizeof(struct jffs2_raw_summary)-8);
580
581         if (je32_to_cpu(summary->node_crc) != crc) {
582                 dbg_summary("Summary node is corrupt (bad CRC)\n");
583                 goto crc_err;
584         }
585
586         crc = crc32(0, summary->sum, sumsize - sizeof(struct jffs2_raw_summary));
587
588         if (je32_to_cpu(summary->sum_crc) != crc) {
589                 dbg_summary("Summary node data is corrupt (bad CRC)\n");
590                 goto crc_err;
591         }
592
593         if ( je32_to_cpu(summary->cln_mkr) ) {
594
595                 dbg_summary("Summary : CLEANMARKER node \n");
596
597                 ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);
598                 if (ret)
599                         return ret;
600
601                 if (je32_to_cpu(summary->cln_mkr) != c->cleanmarker_size) {
602                         dbg_summary("CLEANMARKER node has totlen 0x%x != normal 0x%x\n",
603                                 je32_to_cpu(summary->cln_mkr), c->cleanmarker_size);
604                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
605                                 return ret;
606                 } else if (jeb->first_node) {
607                         dbg_summary("CLEANMARKER node not first node in block "
608                                         "(0x%08x)\n", jeb->offset);
609                         if ((ret = jffs2_scan_dirty_space(c, jeb, PAD(je32_to_cpu(summary->cln_mkr)))))
610                                 return ret;
611                 } else {
612                         jffs2_link_node_ref(c, jeb, jeb->offset | REF_NORMAL,
613                                             je32_to_cpu(summary->cln_mkr), NULL);
614                 }
615         }
616
617         ret = jffs2_sum_process_sum_data(c, jeb, summary, pseudo_random);
618         /* -ENOTRECOVERABLE isn't a fatal error -- it means we should do a full
619            scan of this eraseblock. So return zero */
620         if (ret == -ENOTRECOVERABLE)
621                 return 0;
622         if (ret)
623                 return ret;             /* real error */
624
625         /* for PARANOIA_CHECK */
626         ret = jffs2_prealloc_raw_node_refs(c, jeb, 2);
627         if (ret)
628                 return ret;
629
630         sum_link_node_ref(c, jeb, ofs | REF_NORMAL, sumsize, NULL);
631
632         if (unlikely(jeb->free_size)) {
633                 JFFS2_WARNING("Free size 0x%x bytes in eraseblock @0x%08x with summary?\n",
634                               jeb->free_size, jeb->offset);
635                 jeb->wasted_size += jeb->free_size;
636                 c->wasted_size += jeb->free_size;
637                 c->free_size -= jeb->free_size;
638                 jeb->free_size = 0;
639         }
640
641         return jffs2_scan_classify_jeb(c, jeb);
642
643 crc_err:
644         JFFS2_WARNING("Summary node crc error, skipping summary information.\n");
645
646         return 0;
647 }
648
649 /* Write summary data to flash - helper function for jffs2_sum_write_sumnode() */
650
651 static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
652                                         uint32_t infosize, uint32_t datasize, int padsize)
653 {
654         struct jffs2_raw_summary isum;
655         union jffs2_sum_mem *temp;
656         struct jffs2_sum_marker *sm;
657         struct kvec vecs[2];
658         uint32_t sum_ofs;
659         void *wpage;
660         int ret;
661         size_t retlen;
662
663         memset(c->summary->sum_buf, 0xff, datasize);
664         memset(&isum, 0, sizeof(isum));
665
666         isum.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
667         isum.nodetype = cpu_to_je16(JFFS2_NODETYPE_SUMMARY);
668         isum.totlen = cpu_to_je32(infosize);
669         isum.hdr_crc = cpu_to_je32(crc32(0, &isum, sizeof(struct jffs2_unknown_node) - 4));
670         isum.padded = cpu_to_je32(c->summary->sum_padded);
671         isum.cln_mkr = cpu_to_je32(c->cleanmarker_size);
672         isum.sum_num = cpu_to_je32(c->summary->sum_num);
673         wpage = c->summary->sum_buf;
674
675         while (c->summary->sum_num) {
676                 temp = c->summary->sum_list_head;
677
678                 switch (je16_to_cpu(temp->u.nodetype)) {
679                         case JFFS2_NODETYPE_INODE: {
680                                 struct jffs2_sum_inode_flash *sino_ptr = wpage;
681
682                                 sino_ptr->nodetype = temp->i.nodetype;
683                                 sino_ptr->inode = temp->i.inode;
684                                 sino_ptr->version = temp->i.version;
685                                 sino_ptr->offset = temp->i.offset;
686                                 sino_ptr->totlen = temp->i.totlen;
687
688                                 wpage += JFFS2_SUMMARY_INODE_SIZE;
689
690                                 break;
691                         }
692
693                         case JFFS2_NODETYPE_DIRENT: {
694                                 struct jffs2_sum_dirent_flash *sdrnt_ptr = wpage;
695
696                                 sdrnt_ptr->nodetype = temp->d.nodetype;
697                                 sdrnt_ptr->totlen = temp->d.totlen;
698                                 sdrnt_ptr->offset = temp->d.offset;
699                                 sdrnt_ptr->pino = temp->d.pino;
700                                 sdrnt_ptr->version = temp->d.version;
701                                 sdrnt_ptr->ino = temp->d.ino;
702                                 sdrnt_ptr->nsize = temp->d.nsize;
703                                 sdrnt_ptr->type = temp->d.type;
704
705                                 memcpy(sdrnt_ptr->name, temp->d.name,
706                                                         temp->d.nsize);
707
708                                 wpage += JFFS2_SUMMARY_DIRENT_SIZE(temp->d.nsize);
709
710                                 break;
711                         }
712 #ifdef CONFIG_JFFS2_FS_XATTR
713                         case JFFS2_NODETYPE_XATTR: {
714                                 struct jffs2_sum_xattr_flash *sxattr_ptr = wpage;
715
716                                 temp = c->summary->sum_list_head;
717                                 sxattr_ptr->nodetype = temp->x.nodetype;
718                                 sxattr_ptr->xid = temp->x.xid;
719                                 sxattr_ptr->version = temp->x.version;
720                                 sxattr_ptr->offset = temp->x.offset;
721                                 sxattr_ptr->totlen = temp->x.totlen;
722
723                                 wpage += JFFS2_SUMMARY_XATTR_SIZE;
724                                 break;
725                         }
726                         case JFFS2_NODETYPE_XREF: {
727                                 struct jffs2_sum_xref_flash *sxref_ptr = wpage;
728
729                                 temp = c->summary->sum_list_head;
730                                 sxref_ptr->nodetype = temp->r.nodetype;
731                                 sxref_ptr->offset = temp->r.offset;
732
733                                 wpage += JFFS2_SUMMARY_XREF_SIZE;
734                                 break;
735                         }
736 #endif
737                         default : {
738                                 if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
739                                     == JFFS2_FEATURE_RWCOMPAT_COPY) {
740                                         dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
741                                                     je16_to_cpu(temp->u.nodetype));
742                                         jffs2_sum_disable_collecting(c->summary);
743                                 } else {
744                                         BUG();  /* unknown node in summary information */
745                                 }
746                         }
747                 }
748
749                 c->summary->sum_list_head = temp->u.next;
750                 kfree(temp);
751
752                 c->summary->sum_num--;
753         }
754
755         jffs2_sum_reset_collected(c->summary);
756
757         wpage += padsize;
758
759         sm = wpage;
760         sm->offset = cpu_to_je32(c->sector_size - jeb->free_size);
761         sm->magic = cpu_to_je32(JFFS2_SUM_MAGIC);
762
763         isum.sum_crc = cpu_to_je32(crc32(0, c->summary->sum_buf, datasize));
764         isum.node_crc = cpu_to_je32(crc32(0, &isum, sizeof(isum) - 8));
765
766         vecs[0].iov_base = &isum;
767         vecs[0].iov_len = sizeof(isum);
768         vecs[1].iov_base = c->summary->sum_buf;
769         vecs[1].iov_len = datasize;
770
771         sum_ofs = jeb->offset + c->sector_size - jeb->free_size;
772
773         dbg_summary("JFFS2: writing out data to flash to pos : 0x%08x\n",
774                     sum_ofs);
775
776         ret = jffs2_flash_writev(c, vecs, 2, sum_ofs, &retlen, 0);
777
778         if (ret || (retlen != infosize)) {
779
780                 JFFS2_WARNING("Write of %u bytes at 0x%08x failed. returned %d, retlen %zd\n",
781                               infosize, sum_ofs, ret, retlen);
782
783                 if (retlen) {
784                         /* Waste remaining space */
785                         spin_lock(&c->erase_completion_lock);
786                         jffs2_link_node_ref(c, jeb, sum_ofs | REF_OBSOLETE, infosize, NULL);
787                         spin_unlock(&c->erase_completion_lock);
788                 }
789
790                 c->summary->sum_size = JFFS2_SUMMARY_NOSUM_SIZE;
791
792                 return 0;
793         }
794
795         spin_lock(&c->erase_completion_lock);
796         jffs2_link_node_ref(c, jeb, sum_ofs | REF_NORMAL, infosize, NULL);
797         spin_unlock(&c->erase_completion_lock);
798
799         return 0;
800 }
801
802 /* Write out summary information - called from jffs2_do_reserve_space */
803
804 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c)
805 {
806         int datasize, infosize, padsize;
807         struct jffs2_eraseblock *jeb;
808         int ret;
809
810         dbg_summary("called\n");
811
812         spin_unlock(&c->erase_completion_lock);
813
814         jeb = c->nextblock;
815         jffs2_prealloc_raw_node_refs(c, jeb, 1);
816
817         if (!c->summary->sum_num || !c->summary->sum_list_head) {
818                 JFFS2_WARNING("Empty summary info!!!\n");
819                 BUG();
820         }
821
822         datasize = c->summary->sum_size + sizeof(struct jffs2_sum_marker);
823         infosize = sizeof(struct jffs2_raw_summary) + datasize;
824         padsize = jeb->free_size - infosize;
825         infosize += padsize;
826         datasize += padsize;
827
828         /* Is there enough space for summary? */
829         if (padsize < 0) {
830                 /* don't try to write out summary for this jeb */
831                 jffs2_sum_disable_collecting(c->summary);
832
833                 JFFS2_WARNING("Not enough space for summary, padsize = %d\n", padsize);
834                 spin_lock(&c->erase_completion_lock);
835                 return 0;
836         }
837
838         ret = jffs2_sum_write_data(c, jeb, infosize, datasize, padsize);
839         spin_lock(&c->erase_completion_lock);
840         return ret;
841 }